Anadromous Arctic charr (Salvelinus alpinus (L.)) was investigated to reveal whether an advanced vernal increase in freshwater temperature results in an advanced parr-smolt transformation, measured as an increase in hypoosmoregulatory ability. First generation hatchery reared anadromous Arctic charr from Talvik Research station (69˚ N. Finmark, northern Norway) was reared under a short day regime ...